Quantification of Macroscopic Quantum Superpositions within Phase Space

Details Quantification of Macroscopic Quantum Superpositions within Phase Space Quantification of Macroscopic Quantum Superpositions within Phase Space

2011-01-06

arxiv.org/abs/1101.1209v2

Phys. Rev. Lett. 106, 220401 (2011)

Physics

Quantum Physics

4 pages, 1 figure, accepted for publication in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.106.220401

Based on phase-space structures of quantum states, we propose a novel measure to quantify macroscopic quantum superpositions. Our measure simultaneously quantifies two different kinds of essential information for a given quantum state in a harmonious manner: the degree of quantum coherence and the effective size of the physical system that involves the superposition. It enjoys remarkably good analytical and algebraic properties. It turns out to be the most general and inclusive measure ever proposed that it can be applied to any types of multipartite states and mixed states represented in phase space.

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